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[Heineken <1369028@xxxxxxxxxxxxxxxxxx>]

Yes, unfortunately no change so far. 
A document that shows the effect nicely is this one: (~37 MB)
http://prelude.de/NSX/Service%20Manual%20-%201997.pdf

Simply try to scroll 10-20 pages as fast as your mouse wheel allows. 
Without thumbnail side-bar it scrolls absolutely smooth. When the side-bar is enabled though, every page is stuck loading until it's thumbnail is loaded. 

PS: I tried to file an upstream bug but the description above is so
generic that I got lost evey time I tried.

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https://bugs.launchpad.net/bugs/1369028

Title:
  Slow thumbnail generation and scrolling

Status in evince package in Ubuntu:
  Incomplete

Bug description:
  After a GTK update this morning (2014-09-13, via update manager on
  14.04. LTS), the thumbnail generation on evince 3.10.3 became very
  slow. Whenever loading the next thumbnail image, evince completely
  hangs. This makes reading documents very annoying.

  This seems to be related to these bug-reports: 
  https://bugzilla.gnome.org/show_bug.cgi?id=691448 (!)
  https://bugzilla.redhat.com/show_bug.cgi?id=1047566

  The document opens fine in other viewers (like xpdf)
  When the thumbnails side pane is disabled, the problem goes away.

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